 /*******************************************************************************
  * Copyright (c) 2003, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - Initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.browser;

 import org.eclipse.jface.dialogs.Dialog;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.resource.JFaceResources;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.graphics.FontMetrics;
 import org.eclipse.swt.graphics.GC;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Label;
 /**
  * SWT Utility class.
  */
 public class SWTUtil {
     private static FontMetrics fontMetrics;

     protected static void initializeDialogUnits(Control testControl) {
         // Compute and store a font metric
 GC gc = new GC(testControl);
         gc.setFont(JFaceResources.getDialogFont());
         fontMetrics = gc.getFontMetrics();
         gc.dispose();
     }

     /**
      * Returns a width hint for a button control.
      */
     protected static int getButtonWidthHint(Button button) {
         int widthHint = Dialog.convertHorizontalDLUsToPixels(fontMetrics, IDialogConstants.BUTTON_WIDTH);
         return Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);
     }

     /**
      * Create a new button with the standard size.
      *
      * @param comp a component to add the button to
      * @param label the button label
      * @return a button
      */
     public static Button createButton(Composite comp, String label) {
         Button b = new Button(comp, SWT.PUSH);
         b.setText(label);
         if (fontMetrics == null)
             initializeDialogUnits(comp);
         GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_BEGINNING);
         data.widthHint = getButtonWidthHint(b);
         b.setLayoutData(data);
         return b;
     }
     
     /**
      * Create a new standard label.
      *
      * @param comp a component to add the label to
      * @param text the label text
      * @return a label
      */
     public static Label createLabel(Composite comp, String text) {
         Label label = new Label(comp, SWT.NONE);
         label.setText(text);
         label.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING | GridData.VERTICAL_ALIGN_BEGINNING));
         return label;
     }
 }
